Powder container



April 6, 1943- J. w. MccARTHY ET AL POWDER CONTAINER Filed Jan. 29, 1941 2 Sheets-Sheet l llln-llllllllI rll April 5, 1943- '.1. w. MCCARTHY ET AL 2,315,635

POWDER CONTAINER Filed Jan. 29, 1941 2 Sheets-Sheet 2 Patented Apr. 6, 1943 POWDER CONTAINER J o'h-n W. McCarthy and Herve C. Holly, Lockport, N. Y., assignors to F. N. Burt Company, Inc., Buffalo, N. Y., a corporation of Delaware Application January 29, 1941, Serial No. 376,520

(Cl. .Q3-39.1)

16 Claims.

This invention relates to improvements in containers, more particularly 'to that type .of containers or boxes adapted to hold iinely divided material, such as toilet powders and the like, and also to an improved method of making the same. More particularly the invention relates to a container of the class mentioned embodying an improved structure and arrangement for severing and removing the closing and sealing head `of the receiving part of the container, and to an improved method of constructing .the .container with the improved head severing means.

v'It is a general object of the `invention to provide for containers of the 4class mentioned, an improved severing or rupturing device for the sealing head or closure of the drum or receiving part of the container, whereby said head can be quickly and easily removed without the employment of any special severing implements.

Another object of the invention is to provide an improved severing or rupturing means for the sealing and closure heads of the powder receiving Vdrums of the containers, that can be quickly and easily installed for rapid production in large quantities, as, for example, by means of automatic machinery.

Another object of 'the invention is to provide an improved severing .or rupturing device for containers of the class mentioned which can be automatically installed in operative position in the container without interfering in any way with the sealing qualities of the container yand without interference with the sift-proof seal of the container closure member.

According to another feature of improvement of the invention a rupturing or severing lament, such as a string of textile bres, or of cellulosic material, or of soft metallic wire covered with textile fibres, is installed in an 'improved manner .in the powder drum or receiving part `oi" 'the container, so as to be guided into severing contact with the closure member or sealing drumhead to sever the same with a shearing action at or adjacent to the parts thereof overlying the walls of the receiving drum, thus assuring the quick and easyseverance and removal of the drumhead.

Still another object of the invention is to provide a simple and economical method Yof instal.- lingv the improved rupturing means for the container sealing head by placing said rupturing means or filament in its operative position during 'the steps of constructing the container, and without causing undesirable complications or adding to production costs.

Other objects of the invention will be in part pointed out in the subjoined detailed description of certain illustrative but preferred embodiments of the invention, and will be in part obvious as the disclosure proceeds.

The invention accordingly comprises an article of manufacture having the features properties and relation of elements, vand also comprises the several `steps and the relation of one or more of such steps to each of the others., which will be exemplified in lthe article and method hereinafter disclosed, and the scope of the application of which will be indicated in the claims.

For a more comprehensive disclosure of the nature, objects and advantages of the invention, reference is had to the following detailed disclosure and to the accompanying drawings, in which:

Fig, 1 is a perspective view of a powder box or container embodying the invention, parts being broken away and in section in order to disclose the improved structure;

Fig. 2 is an enlarged central vertical section through the container of Fig. 1;

Fig. 3 is a fragmentary section similar to Fig. 2, showing a detail of the structure and showing the container in inverted position;

Fig. 4 is a detail plan View showing the drum or wall structure and showing the position of the closure severing filament installed thereon;

Fig. 5 is a fragmentary diagrammatic detail view showing a step in the method of installing the severing iilament during Vthe construction of the drum wall;

Fig. 5A is a view similar to Fig. 5 showing another step of installing the severing lament;

Fig. 6 is a fragmentary enlarged section substantially on the line 6-6 of Fig. fi and showing another step of the method of installing the severing filament and of applying the closing and sealing head to the receiving drum;

Fig, 7 is a View similar to Fig. 6 showing another step of the improved method;

Fig. 8 is a fragmentary perspective view of a receiving drum showing the manner of severing the drumhead by operation of the severing lament;

Fig. 9 is an enlarged vertical section similar to Fig. 2 but showing a modified structure of the improved closure severing means;

Fig. 10 is a fragmentary perspective view of the receiving part or drum of the container, parts being broken away and in section in order Figs. 14, 15 and 16 are enlarged partially diagrammatic, perspective views of three different preferred forms of the severance filament.

It is to be understood that the showings of the different figures of the drawings are diagrammatic to a considerable extent, parts of the structures, such as the container walls, head of the receiving drum, the plies of the drum wall, and the severing filament, being considerably magnifled in thickness and size so as to disclose the structure and arrangement more clearly. Also, while the container disclosed is circular in shape, it will be understood that it may assume other shapes, such as elliptical, triangular, rectangular, polygonal, etc.

Referring rst to the embodiments of Figures 1 to 8 inclusive, for a detailed disclosure of the invention, a box indicated generally at l is shown having a base part or section 2, and a cover 3 having side walls or flanges adapted to telescope with the side Walls or flanges of the base 2. This and other parts of the container may be made of sheet material, such as paper or the like. The material receiving element or powder receiving drum 4 is adapted to receive the powder or other material and is made of a size to telescope within the side walls or anges of the base member 2.

A sealing member 5 extends around the outer surface of the receiving drum 4 so as to make a tight anti-sift joint between the receiving drum and the base section of the container.

Since the structure of the container may be generally similar to that described in the Dreux et al. Patent No. 2,057,293 granted October 13, 1936, a detailed description of such structure here is deemed to be unnecessary. For this purpose reference is made to said Dreux et al. patent and also the earlier Dreux et al. Patent No. 2,036,928 granted April '7, 1936.

In the embodiment of Figures 1 to 7 inclusive, the material receiving drum 4 has walls 6 of laminated structure, being preferably made up of plies or laminations of paper or similar material, spirally or convolutely wound one over another and adhesively secured together, as fully described in the prior patents above referred to. The number of plies may vary in actual practice, four plies being shown in the present drawings. The lower end of the receiving drum, as shown in Fig. 2, is open and rests against the bottom of the base member 2. The upper end of the drum is closed and sealed by a sheet closing member or head 1. The closing head 'I of the drum is preferably in the form of a thin sheet or membrane that may be of paper or of sheet cellulosic material, such, for example, as Cellophane, and it may be transparent or translucent. As shown, the drumhead 'l extends across the upper ends of the laminated wall B and across the ends of the plies thereof, being provided with an outer peripheral attaching flange 8 extending downwardly along the outer surface of the drum walls and preferably adhesively attached thereto.

The drumhead thus closes and tightly seals the upper end of the receiving drum so as to avoid any sifting of the powder through the upper end of the drum. A cover strip 9 of paper or similar sheet material is adhesively attached to the outer surface of the drum, preferably as shown, overlying the sealing member or bead 5 and extending outside of and being adhesively attached to the peripheral attaching ange 8 of the drumhead '1.

Heretofore there has been considerable difculty in rupturing or severing the closure head l and removing the same when it is desired to open the container when using the contents thereof. The cellulosic or similar sheet material used for this closure member is ordinarily quite strong and tough and its severance has caused considerable diculty and has resulted in the spilling of powder and soiling of extraneous articles. For the purpose of quickly and easily severing the closure head 1 and avoiding the trouble mentioned, the lamentary severing member I0 has been installed upon the receiving drum 4 in position for severing the drumhead merely by pulling upon the free end or extension Il of the severing lament.

In the preferred embodiment shown in Figure l to '7, the drumhead severing filament lil is em-` bedded in the laminated wall structure 6 of the receiving drum, being preferably located therein, as shown, between adjacent plies of the wall and closely adjacent to the overlying marginal portions of the drumhead 1. It will be noted that the drumhead 'I is ordinarily tightly stretched across the upper ends of the wall 6 so that the marginal portions of the head overlying the Wall edges are positioned adjacent to the severing lament as clearly seen in Fig. 2. The severing filament ii] is ordinarily positioned as close to the upper edge of the drum wall 6 as practicable and may be about 1/8" or even less from the adjacent edges of the wall.

As mentioned above, the closure severing lament le is embedded in the drum wall 6 between adjacent plies thereof, the plies being adhesively attached together, both above and below the filament so as to hold the latter securely in its embedded position. Also, the severing filamentA extends entirely around the receiving drum closely adjacent to the peripheral attaching.

ange 8 of the closure head 1. Also, as shown in Fig. 4, the opposite ends of the severing flla. ment ID overlap` to a considerable extent, the.

purpose of which will be apparent as the disclosure proceeds.

The free or operative end portion Il of the severing filament I may be positioned above the drumhead in position for convenient access, as seen in Fig. 2. In order to avoid puncturing or tearing the closure head 'I or the peripheral attaching flange 8 thereof, it will be Aseen upon reference to Figures 2, 4, 6 and 7 that the end portion of the filament at the point Where it emerges from beneath the outer ply or lamination is deflected laterally or downwardly at I2 along the outer surface of the drum, and then is deflected laterally or upwardly at i3, thus` forming a loop around the edge of the peripheral attaching flange 8. It willalso be noted that the downwardly deflected part l 2 of the lament lies i .cover strip 9 `outside of the flange additionally assure a tight seal at the place where the severing .filament passes from its position between the plies tothe operating free-end portion I I thereof.

From the foregoing disclosure it will be seen .that the severing lament Il! is installed in the laminated wall structure of the receiving drum with the protruding end portion Il thereof conveniently accessible when the box cover 3 is removed. When it is desired to sever the closure head 'I a pull is exerted upon the end II of the severing lament, the rst action being to cause the filament to cut through the attaching lange 8 of the head .as can be seen in Figures 2, '7 and 8. As pull continues the filament embedded between the wall laminations will be guided and directed by the adjacent laminations into contact with the marginal portion of the closure head directly Aoverlying these laminations. The result is that the marginal portion of the .head is severed with a shearing action that is very effective in forming a clean and complete severance I4 of the head -'I. During this shearing action the severance is promoted by virtue of the fact that the line of severance I4 is closely adjacent to the peripheral attaching flange 8 so that the marginal portion of the drumhead at the .severance line is supported land held in Vposition .by .the attaching ilange during severance around the .entire periphery of the drumhead. Since the inner' end portion of the severing lament I overlaps the outer end portion thereof, as shown in Fig. 4, the severance of the head entirely around the same can be effected before the filament is entirely freed from its embedded position between the plies. Continued pull upon the filament after complete lremoval of the head will remove the .string entirely from its position in the drum walls. Thus, `the dl'uinhead be quickly and easily severed .removed without any danger of spilling the powder.

According to the improved method o1 constructing the receiving drum with the improved severing lament installed therein, the iilament is preferably .fed or wound into 4position between the .plies of drum wall structure when said plies are spirally wound one upon another to form the walls. This improved method will be understood upon reference to Figures 4, 5, 5a, 6 and 7 of the drawings. The sheet mate-rial I5 forming the plies .of the .drum wall may be fed from a supply source (not shown) and spirally wound upon a rotary cylindrical mandrel I6 that may be hollow and peripherally perforated and provided with suction or air exhausting means for holding the inner plies in position thereon during the winding operation. Adhesive may be applied by any known means to the outer surface of the Sheet ymaterial as it is wound upon .the mandrel I 3. The adhesive applicator is indicated diagrammatically at I'I.

As the winding of the sheet material on `the rotating mandrel I progresses, the free end of the string or severing filament Ill is introduced into the grip between two adjacent plies the surface of the mandrel. This may be accomplished in any desired manner, either by hand during manual operation of the method, .or by a tool or implement I8 that .may be part of .automatic mechanism. After introduction of the free end of the string I0, winding continues for slightly more than one complete revolution whereupon the strip or sheet member is severed by va `severing knife indicated diagl'ammatically at I9, and then a little later the filament I0 is severed by a yknife or cutting `element .20. Pressure .may be applied to the laminated wall structure .during the wind- -in-g operation so `to assu-re close contact and secure adhesive attachment of the overlying spil-.ally wound plies. This results also in embedding the severing filament between the laminations `of the drum wall so as to extend entirely therearound -with overlapping end portions as described.

After the severing -lament I has been wound into position between the plies, as described, the next step in the process may take place, which is the placing of the drumhead 'I into position upon the upper end of the drum wall. For this pur-pose a turnover ring 2l may be employed `to place the sheet material forming the drumhead into position on lthe drum walls. As shown, the turnover ring may have a peripheral flange engaging the marginal portion of .the sheet head 1 to ti. .n over the marginal parts thereof, thus forming `the attaching .flange t of the drumhead. During this operation the end II of the severing string is deflected laterally and downwardly at the outer surface oi" the drum wall 6 to avoid interfering with the positioning of the attaching ange 8. This may be accomplished in any convenient manner either by hand, or when automatic machinery is employed, by means of a tool or implement 22. When the string is thus deflected it will be positioned closely adjacent to the severed end of the outer ply, as above described. Since the outer surface of the outer ply is coated with an adhesive material, the attaching flange is adhesively attached in position it is pressed on by action of the turnover ring 2l, thus assuring a tight seal.

Before application of the cover strip 9 the end of the severing string l! -will be reversely deflected `over the outer surface of the attaching flange v8, as indicated in Fig. 7. This may either be Aaccomplished manually or by means of a tool or implement -23 that may be a part of automatic machinery. When the string is thus held in `this position the cover strip is which may be accomplished by continued rotation cf the mandrel J6, the cover strip 9 being adhesively attanned to theoutor surface of the drum and exteneri ng `entir^ly therearound.

In the .modified embodiment of the invention disclosed in Figures 9 Yto the general structure of ,the .container may be the same as that scribed above in connection with Figures l to 8, and ythe corresponding parts are designated by the same reference numerals with the laddition of the index en However, in this embodiment the positioning of the drumhead severing lila- Ia modified `over the `prior disclosure. being installed on the outer sur-face of the walls Ba .of the drum 4a instead of between adjacent laminations of .the drum walls as previously -described. For this reason. the drum wall structure may, -if desired. vary from above described, and .may either .be laminated according to the previously described embodiment, or of some other wel] known. approved type of structure either .laminated or not.

As `shown in vthe drawings, the or lament ma positioned on the outer surface of the wall Aiid of the powder receiving' drum 4a, short distance from the upper terminal of the walls about the same distance Vas described in connection with the prior embodiment. The severing string, as `in the prior embodiment, is positioned beneath the attaching peripheral flange 8a of the closing drumhead 'a and the severing string cover strip Sia of paper or similar sheet material is adhesively secured to the outer surface of the drum walls, overlying the peripheral attaching flange 8a. The cover strip 9a also overlies the sealing bead or a member ad as in the prior embodiment. As best seen in Figures and 13, the outer end portion of the severing string 1| da is deflected downwardly at lia beneath the attaching flange Ea, passing around the lower edge of the flange and deflected upwardly across said flange as indicated at i3d, and the free operating end l la of the string is positioned above the drumhead for convenient access. Since both the attaching flange fic and the cover strip 9a are adhesively secured in position to the outer surface of the drum walls and the upper edge of the cover strip 5a is adhesively attached to the flange, a tight sealing joint is assured between the closure head la and the interior on the receiving drum so as to avoid sifting of the powder.

As in the prior embodiment, it will be noticed that the marginal portions of the drumhead la overlie the severing iilarnent Illa entirely around the periphery of the drumhead, and that the peripheral attaching flange 8a, is positioned just outside of the severing filament; also, the upper edge of the cover strip 9a is attached to the ange all the way around the container outside of the severing filament. Due to this arrangement 'the flange and cover strip cooperate with the adjacent drum wall to support the severing string in its position and to guide it when it is pulled into severing engagement with the marginal portion of the drumhead just outside of the drum walls 6a. Consequently, the drumhead is severed at said marginal portion with a shearing action analogous to that above described in connection with the other embodiment.

In the method of constructing the drum and assembling the severing filament according to the embodiment of Figures 9 to 13, the preformed drum or the walls 6a thereof may be slid onto the rotary mandrel Ita in a manner similar to that above described and as indicated in Fig. 11. The severing string lila may then be Wound into its correct position on the outer surface of the drum by rotating the latter. For the purpose of temporarily retaining the string in this position, in which it is thus wound an adhesive may be applied to the outer surface of the drum, or directly to the string, or said string may be held in position by some other convenient means. When the string has thus been placed in position, it is severed by means of a knife or cutting implement 2da so as to leave the free operating end portion Ila.

When the severing string has been thus applied to the outer surface of the drum walls the free end portion Ila of the string is deflected downwardly or laterally along the outer surface of the drum as at ign, and this deflection may be effected as described in connection with the prior embodiment, either manually or by means of a tool or implement 22a. When the string is thus deflected the head 'la is applied in position, as, for example, by means of the turn over ring 2id, which is caused to advance onto the end of the drum, thus carrying the drumhead 'la into its final position and turning the peripheral attaching flange downwardly along the outer surface of the drum over the severing string ma and, at the same time, adhesively attaching the flange to the outer surface of the drum.

After application of the drumhead la, as described, the severing string or filament is deiiecte'd upwardly'along the outer surface of the attaching flange so as to position the free end for access above the drumhead. This deflection may also be accomplished by means of a tool or implement 23a, as above described. When the string is thus deflected the cover strip 9a is applied and adhesively attached in position which may be done by further rotation of the drum and mandrel.

Three preferred forms of severing laments are shown diagrammatically in Figures 14, 15 and 16 at Ib, iic and Illd respectively. The severing filaments may be of any desired cross-sectional shape and they are preferably relatively small so as to occupy little space when installed in operative position. The filament or string IBbof Fig. 14 is constructed of spun textile fibres, such as silk, cotton, linen, etc. The filament Ic of Fig. 15 has a fine metallic wire core 24 of soft copper or similar soft metal, which is covered with a cover 25 of woven textile material, such as silk, cotton, linen, etc., similar to the well-known insulated wire. rihis structure of severing filament is particularly effective, when installed as above described, in effecting severance of the drumhead. The filament ld of Fig. 16 is constructed of cellulosic material such as Cellophane and this also is found in practice to be effective in severing the celiulosic sheet material of the drumhead. Any of these different severing filaments may be employed in the different embodiments of the invention above disclosed.

Since certain changes in carrying out the above process, and certain modifications in the article which embody the invention may be made without departing from its scope, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having described our invention, what we claim as new and desire to secure by Letters Patent is: l. In a container, in combination, a material receiving part having an enclosing side wall and a frangible closing head of sheet material, outer attaching means attaching said head to said side wall, and a filamentary severing member including a soft metal wire core covered with a coating of softer material, said severing member being carried by said receiving part and positioned adjacent to marginal parts of said head above the end edge of said side wall and inside of said attaching means so as to be operable to sever said head along said marginal parts thereof at points inside of the attaching means. 2. In a container, in combination, a material receiving part having an vvenclosing side wall 21nd a frangible closing head of sheet material, a filamentary severing member carried by said receiving part and positioned adjacent to said head forsevering the same to open the receiving part, and supporting and guiding means for said lamentary severing member for guiding the latter, when pulled, into severing engagement with said head.

3. In a container, in combination, a material receiving part having an enclosing side wall and a frangible closing head of sheet material having marginal parts extending outwardly across the adjacent end edge portions of said side wall. said marginal parts of the closing head having outer attaching means for attaching the head to said side wall, and a lamentary severing mem-t ber carried by said receiving part and positionedvv adjacent to and extending along said marginal parts of the head inside of said attaching means thereof for severing the latter along said marginal parts.

4. In a container, in combination, a material receiving part having an enclosing side wall and a closing head of sheet material having marginal parts overlying end portions of said side wall, a iilamentary severing member carried by said receiving part and positioned adjacent to and extending along said marginal parts of the head for supporting the latter along said marginal parts, said closing head having a peripheral attaching flange attached to said wall outside of said iilamentary member, and supporting and guiding means for said severing member for guiding the latter during severing action, into severing engagement with said overlying mar ginal parts of said head.

5. In a container, in combination, a material receiving part having an enclosing side wall and a closing head of sheet material having marginal parts overlying end portions of said side wall, a lamentary severing member carried by said receiving part and positioned adjacent to and extending along said marginal parts of the head for severing the latter along said marginal parts, said closing head having a peripheral attaching flange attached to said wall outside of said lamentary member, said wall of the receiving part having an outer attached layer of sheet material positioned outside of said filamentary severing member and cooperating with adjacent parts of the wall for guiding said lamentary member, during severing action, into severing engagement with overlying parts of said head.

6. In a container, in combination, a material receiving part having an enclosing side wall and a closing head having marginal parts overlying end portions of said side wall, a filamentary severing member carried by said receiving part and positioned adjacent to and extending along said marginal parts of the head for supporting the latter along said marginal parts, said closing head having a peripheral attaching flange attached to said wall outside of said lamentary member, supporting and guiding means for guiding said severing member, when pulled, into severing engagement with said overlying marginal parts of said head, the outer end portion of said lamentary severing member being deflected laterally across said attaching flange and having an operating end part beyond said deflected portion.

7. In a container, in combination, a material receiving part having an enclosing side wall of laminated structure, a closing and sealing head of sheet material attached to said side wall, and a larnentary severing member embedded in said side wall between the laminations thereof and positioned adjacent to said head for sev ering the same to open the receiving part.

8. In a container, in combination, a material receiving part having an enclosing side wall of laminated structure, a closing and sealing head of sheet material for said receiving part, a lamentary 4severing member carried by said receiving part and positioned between adjacent laminations of said wall and adjacent to said head for severing the same, and an attaching flange on said head outside of but closely adjacent to said fllamentary severing member and attached to the wall.

9. In a container, in combination, a material receiving part having an enclosing side wall of laminated structure in which the laminations are spirally wound, a closing and sealing head of sheet material for said receiving part, a lamentary severing member carried by said receiving part and positioned between adjacent laminations of said wall and adjacent to said head for severing the same, an attaching flange on said head outside of but closely adjacent to said filamentary severing member, the outer end portion of said lamentary severing member being deflected laterally across said attaching ange adjacent to the end of the outer spirally wound ply and having an operating end part beyond said deflected portion.

10. In a container, in combination, a material receiving part having an enclosing laminated side wall including attached plies, a closing and sealing head of sheet material for said receiving part having marginal parts positioned across end portions of said side wall and across the plies thereof, a lamentary severing member embedded in said side wall between adjacent plies thereof and extending entirely around said wall adjacent to said marginal parts of the head, whereby said filamentary severing member during severing action is supported and guided by the plies to sever said head With a shearing action along said marginal parts thereof, and a peripheral attaching flange for said head outside of but closely adjacent to said lamentary severing member and extending along and attached to said wall.

ll. In a container, in combination, a material receiving part having an enclosing side Wall, a closing and sealing head for said receiving part having marginal parts positioned across end portions of said side wall, a lamentary severing member extending around said side wall adjacent to said marginal parts of said head for severing the same along the outer extremity of said marginal parts but inside of the later mentioned attaching flange, :a peripheral attaching flange for said head extending along said wall outside of but adjacent to said iilamentary severing member, and attached to said wall, and a cover strip extending around and attached to said wall outside of said attaching flange.

l2. A method of forming a material receiving part for containers, including: placing a severing filament around the Wall of the receiving part, deflecting an end portion of the filament transversely of the applied part thereof along the outer surface of the Wall away from the adjacent end thereof, and then when said end portion is deflected applying the marginal attaching flange of a sheet closure head to said Wall outside of said dellected end portion of the severing filament, and attaching said flange to hold the head and filament end portion in position.

13. A method of forming a material receiving part for containers, including: placing a severing lament around the wall of the receiving part, deilecting an end portion of the filament along the outer surface of the Wall away from the adjacent end thereof, then when said end portion is deflected applying the marginal attaching :flange of a sheet closure head to said wall outside of said severing filament, deilecting the end portion of said filament reversely outside of said attaching flange, and then applying and attaching a ply of material outside of said attaching ilange and over said reversely deflected end portion of the filament.

14. A method of forming a material receiving part for containers, including: Winding plies of sheet material one over another to form a laminated wall, introducing the end of a severing lament into the grip between two adjacent plies, completing the placing of the filament by simultaneously winding it and the ply into position, adhesively attaching the filament and plies in position in the wall during the winding of said plies, and severing the sheet material and lament at spaced points so that the end portion of the filament projects beyond the adjacent end of the outer ply.

15. A method of forming a material receiving part for containers, including: winding plies of sheet material one over another to form a laminated wall, introducing the end of a severing filament between two adjacent plies, completing the placing of the filament by simultaneously winding it and the ply into position, severing the ply and filament and defiecting the end portion of the lament along the outer surface of said wall, and then applying the marginal attaching iiange of a sheet closure head outside of said deiiected end portion of the filament.

16. A method of forming a material receiving part for containers, including: Winding plies of sheet material one over another to form a laminated wall, introducing the end of a severing filament between two adjacent plies, completing the placing of the filament by simultaneously winding it and the ply into position, severing the ply and filament and deiiecting the end portion of the filament along the outer Surface of said wall, then applying the marginal attaching flange of a sheet closure head outside of said deected end portion of the filament, deiiecting the end portion of said lament reversely outside of said attaching iiange, and then applying and attaching a ply of material outside of said attaching flange and over said reversely deflected end portion of the lament.

JOHN W. MCCARTHY. HERVE C. HOLLY. 

